How do I remove a computer virus?

So I have a problem with my computer. I do not know if I have a virus or not, in any case my computer just turns off like that (after a few days) without receiving the command, or I press the off button for 10 seconds because my laptop just suddenly I do not know what and the sizes of apps and Youtube, etc. Gergrößern and the screen is black and so on, so in any case, I turn it off and then he must install Windows and all apps and photos are deleted and so.

But I can find them again if I search for them, so enter in the search term. But it is still annoying because I can no longer use apps like Snipping Tool and Windows + G, because the apps are deleted. Can help with somehow stopping that without spending money on anti-virus.

Secure your personal data if not done yet. Then you install Windows completely from a bootable medium (for example, USB stick) so that all software-related defects should be resolved.

If the pc still has problems then it seems to be a hardware defect and either you have it repaired or you buy a new one.

If I figure out the right one, you can always run the calculator, give it some breathing space, and turn it off at the end of the day. Then the operating system can also sort itself again.

Ok, thanks, I'm trying